Package Manager indicator has incorrect, old wording and bad grammar

[Stuart Langridge]

If I create an issue with installed packages, I get a "no entry sign" icon in my Ubuntu 20.04 top panel. (I am not sure which package creates this indicator; please reassign if it's not software-properties.) This indicator has a menu (screenshot attached) with text reading:

An error occurred, please run Package Manager from the right-click menu or apt-get in a terminal to see what is wrong. The error message was: ' Error: BrokenCount > 0' This usually means that your installed packages have unmet dependencies

This message has numerous problems.

1. There is no "right-click menu"; a left-click or a right-click on this icon both show the same thing
2. There is no "Package Manager" entry in the shown menu (there is the error message above, a separator, "Show updates", a separator, "Show notifications", and "Preferences")
3. It recommends running "apt-get" which should be "apt"
4. The error message has a space at the start of it
5. The error message uses straight quotes rather than typographic quotes
6. It does not end with a full stop despite being written as prose

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: software-properties-gtk 0.98.9.5
ProcVersionSignature: Ubuntu 5.11.0-27.29~20.04.1-generic 5.11.22
Uname: Linux 5.11.0-27-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27.20
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sun Sep 19 17:07:00 2021
InstallationDate: Installed on 2020-06-20 (456 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
PackageArchitecture: all
SourcePackage: software-properties
UpgradeStatus: No upgrade log present (probably fresh install)

[Aptivi (eofla)]

The strings are found in the update-manager package.

https://git.launchpad.net/ubuntu/+source/update-notifier/tree/src/update.c?h=ubuntu/impish#n593